@article{KYB_1975_11_4_a4,
     author = {Dole\v{z}al, Jaroslav},
     title = {Existence of optimal solutions in general discrete systems},
     journal = {Kybernetika},
     pages = {301--312},
     year = {1975},
     volume = {11},
     number = {4},
     mrnumber = {0490220},
     zbl = {0318.49007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1975_11_4_a4/}
}